Why is my BlackBerry 9860 freezing at 75 - 80 booting screen?

Hello everyone,
Please, i need your help
I have a bb 9860, recently started freezing; tried the battery pull several times, nothing happened (still freezes at 75 - 80%); tried reloading the os yet still same; i have try downgrading it to lower os, still doing same thing. i did nuked the phone and reloaded another os still freezing.
i tried connecting the phone to the computer while frozen, not a sign to show that the phone was connected. left it for a while tried a battery pull while the phone was still connected to the computer, i noticed that the boot screen was still there. i had to disconnect the phone and then reconnect again
Please, is there a solution to this?
i'll be grateful if anyone could help me with a solution.

I have read similar issue like this on Bold 99xx. Apparently the internal memory storage wears out after some time. The only solution seems to be completely disable the internal memory storage.

I am not sure whether this issue happens on 9860, I just remember that the symptom is similar (stuck at bootscreen, 75%).

Do some Google search with keywords 'BIMS' you may find some info.

... Z30STA100-2/10.3.1.1154 ...